Emperor Franz Joseph I of Austria reigned from 1848 to 1916, making him one of the longest-serving monarchs in European history. He ascended to the throne during a time of political upheaval and worked to stabilize the Austro-Hungarian Empire. His reign saw significant changes, including the establishment of the dual monarchy in 1867. Franz Joseph was known for his conservative policies and efforts to maintain the empire's unity amid rising nationalism. He faced numerous challenges, including military conflicts and social unrest, but remained a symbol of stability for many of his subjects throughout his long reign.